Round corner



Sept. 14, 1937. R. H. CROUCH 2,092,833

' ROUND CORNER I Filed 001,. l3 1936 Patented Sept. 14, 1937 UNITED STATES ROUND CORNER, Richard H. Crouch, Pulaski, Va.

Application October 13,

3 Claims.

in conjunction with the core block and the stock,

all cooperating together to constitute. the round corner.

In the accompanying drawing:

Fig. l is a top view illustrating a preliminary stage in the formation of the round corner;

Figs. 2 and 3 are top views illustrating 'two progressive stages;

Fig. 4 is a top view of the completed corner;

Fig. 5 is a view in perspective of the block; and Fig. 6 is a view in perspective of one side of the block after the original block has ,been channeled throug 7 The numeral i represents the so-called stock employed in the manufacture of this round corner. This is preferably, although not necessarily, made of plywood with the usual core of less expensive material, and one or more veneers on one or both faces. The various figures of the drawing show what is termed a three-ply ply- 3O wood. While the stock I may be of various thick nesses, my preference is that it should be ap-" proximately 2. quarter of an inch in thickness,

as this affords suflicient stock'for the purpose,

that is to say in the manufacture of furniture, 5 and at the same time it reduces weight, and it affords very desirable flexibility in the manufacture of these round corners, and gives a very marked and distinctive appearance to the completed furniture. r

The numeral 2 represents a block of any suitable material which is glued fast to the stock I, and to hold it plumb and prevent it slipping while glued and under hydraulic pressure, the block is provided with a tongue 3, preferably extending throughout its length, which enters a groove 4 formed in the stock therefor. This is an entirely temporary expedient, but is very effective in insuring the proper joining of the stock I and block 2.

When thus formed, the channel is out through the block and stock to a depth limited only by the bottom veneer, when veneer is used, as shown in Fig. 2. A cutter-head is designed to cut all edges of the channel block as illustrated in Fig.

2, and in so doing cuts the rabbet joint through 1936, Serial No. 105,436

the stock, and the two edges 5 and ii'preferably at right-angles toeachother as clearly appears in Figs. 2, 3, 4 and'6. V

The rabbet-joint is cut with three edges 1, 8 and 9 preferably extending at right-angles toone 7 another; and a core block it) generally straight on" the edge 5 I and rounded on the edge I2, as shown in Figs. 3 and 4, is fashioned at the opposite edges to precisely fit the three surfaces I, 8 and 9 going to form the rabbet-joint, as is clearly illustrated in Fig. 4.

As the block 2 is cut to form the surfaces 5 and. 6, a shoulder of slight depth I3 is formed, and this forms a slight continuation of, and a recess in alignment with, the surfaces 9 of the rabbetjoint as clearly viewed in Figs. 2, 3 and 4, and the shoulder I3 is shown in perspective in Fig. 6.

In the final formation of the round corner,' after the center channel is cut through the block .2 and the stock I in the predetermined outline as illustrated inFig. 2, the core block l0 previously.

fashioned is dropped into the recess. It could he slid in, but it is easier and quicker to; drop it in; Then the parts are brought around under pressure, so thatthe sections of the stock I are at 25 right-angles to each other, and the edges 6 ofthe channel-block 2 come directlyv in contact with 7 each other as shown in Fig. 4, they being glued on all contacting edges, that is to say tothe edge; a l I of the core block Ill, along the surfaces 5, and the edges 6 are glued together as the rabbet joint is also glued. r

When the parts are thus all broughttogether, I screws Hi may be screwed into the sections of the block as illustrated in Fig. 4, thereby making a smooth, rigid, permanent, and substantial round corner. f V The rabbet formation of the-joint between the stock l and the core block I6 isof primary importance, and the surface 8 constitutes a stop against the corresponding surface in the :edge of the core block it), and while the bringing of the cores to a position at'right-angles, as shown in 'Fig. 4'applies a strain upon every contacting surface, this strain is distributed and applied more '45 or less evenly, and the surfaces 8 of the rabbet joint absolutely preclude any resultant bulging at the points l5 which is common to allother round corner work hitherto devised, and therein Y rests a very outstanding advantageous feature of 50 my present invention, which, in connection with the other cooperating parts asherein described createsa substantial and. durable round corner with a perfect uniform curvaturethroughout.

Incidentally, it might be mentioned that the 6.5

stock need not necessarily be ply-wood, but could be a solid strip of material, and then the channel formed by the cutter-head will still leave the required stock reduced in thickness and suitably fashioned at the edges as a rabbet-joint to constitute the required facing of the round corner.

I claim:

1. A round corner composed of stock of suitable and predetermined thickness and material, a block secured thereto, the block and stock channeled through to a predetermined depth with edges of predetermined outline, a core block having an outer surface rounded to the shape of the corner desired, said core block inserted in the channel formed in the block fastened on the stock, the edges formed to fit and interlock with the edges of the stock, and the edges of the block finally brought in juxtaposed position with the inner surface of the core block and with each other, all contiguous and contacting surfaces rigidly secured together.

2. The combination with a strip of stock, and a block secured thereon, the block and stock channeled through to a predetermined depth to leave a portion of the stock of reduced thickness and to cut the ends of the stock and the inner edges of the block into predetermined shape, of a core block having inner and outer surfaces, and the edges of which are fashioned tofit the edges of the stock, the reduced portion of the stock bent around and secured to one surface of the core block, the edges of the stock and ends of the core block brought together to form a rabbet-joint, and edges of the channeled block contacting one surface of the core block and each other and secured rigidly together.

3. The combination of ablock and stock secured together, and channeled out to leave a reduced portion of the stock and two inner surfaces of the block being at approximately rightangles to each other, and to form shoulders in addition to joints at the edges of the stock, with a core block fashioned at the opposite edges to fit the joints and shoulders formed in the opposite edges of the stock and channeled block, the sections of the channeled block brought together with surfaces in contact with each other and with one surface of the core block, and means extending through these sections to hold them together to form a rigid corner post or brace.

RICHARD H. CROUCH. 

